OneNAND512Mb(KFG1216U2B-xIB6)
FLASH MEMORY
Invalid Block Table Creation Flow Chart
Start
Set Block Address = 0
Increment Block Address
Check "FFFFh" at the 1st word of sector 0
of spare area in 1st and 2nd page
*
No
No
Check
Create (or update)
Invalid Block(s) Table
"FFFFh" ?
Yes
Last Block ?
Yes
End
3.14.2 Invalid Block Replacement Operation
Within its life time, additional invalid blocks may develop with NAND Flash Array memory. Refer to the device's qualification report for
the actual data.
The following possible failure modes should be considered to implement a highly reliable system.
In the case of a status read failure after erase or program, a block replacement should be done. Because program status failure
during a page program does not affect the data of the other pages in the same block, a block replacement can be executed with a
page-sized buffer by finding an erased empty block and reprogramming the current target data and copying the rest of the replaced
block.
Block Failure Modes and Countermeasures
Failure Mode
Erase Failure
Detection and Countermeasure sequence
Status Read after Erase --> Block Replacement
Status Read after Program --> Block Replacement
Error Correction by ECC mode of the device
Program Failure
Single Bit Failure in Load Operation
94
SAMSUNG [ SAMSUNG ]
